//
//  UINavigationController+SafePush.h
//  objective_c_language
//
//  Created by 王玉龙 on 2018/6/20.
//  Copyright © 2018年 longlong. All rights reserved.
//

#import <UIKit/UIKit.h>

/*
 解决  can't add self as subview 
 
 */
@interface UINavigationController (SafePush)
<UINavigationControllerDelegate>

@property(nonatomic ,assign) BOOL viewTransitionInProgress;

@end
